Search Result for "amnion": 
Wordnet 3.0

NOUN (1)

1. thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals);
[syn: amnion, amniotic sac, amnios]


The Collaborative International Dictionary of English v.0.48:

Amnion \Am"ni*on\, n. [Gr. ? the membrane round the fetus, dim. of ? lamb.] (Anat.) A thin membrane surrounding the embryos of mammals, birds, and reptiles. [1913 Webster]
WordNet (r) 3.0 (2006):

amnion n 1: thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) [syn: amnion, amniotic sac, amnios]
Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "amnion": allantoic membrane, amniotic sac, arachnoid membrane, basement membrane, conjuctiva, eardrum, hymen, maidenhead, membrana serosa, membrana tympana, membrane, meninges, meninx, neurilemma, pellicle, pericardium, perineurium, pleura, serosa, tympanic membrane, tympanum, velum